Lighting device with off-state white appearance
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United States of America Patent
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Mar 20, 2018
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N/A
app pub date -
Sep 10, 2010
filing date -
Sep 17, 2009
priority date (Note) -
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Abstract
A lighting device (400) with an off-state white appearance is provided. The lighting device comprises a light source (403), having a white appearance in an on-state and a colored appearance in an off-state, and a switchable optical element (404) downstream from the light source. The colored appearance of the light source is caused by a photoluminescent material in the light source. The switchable optical element has at least a transmissive state and a state being reflective in the wavelength region in which the light source absorbs light, resulting in a white appearance when the light source is in its off-state and the switchable optical element is in its reflective state. According to an embodiment of the invention, the lighting device (400) is arranged as a luminaire further comprising an optical cavity (401) and a window (402) covering the optical cavity. The light source (403) is arranged inside the optical cavity and the window is provided with the switchable optical element (404).
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